Balance Sheet Details (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Accounts receivable:
Accounts receivable	$ 91,611	$ 80,850
Allowance for doubtful accounts	5,898	5,703
Inventories:
Finished goods	155,354	139,888
Work in process	1,826	1,188
Raw materials	4,080	4,828
Repair parts	10,690	10,283
Operating supplies	1,444	1,362
Total inventories, less allowances of $4,452 and $4,091	173,394	157,549
Inventory allowances	4,452	4,091
Prepaid and other current assets:
Value added tax	6,667	3,850
Prepaid expenses	8,099	5,036
Deferred and prepaid income taxes	8,194	4,070
Derivative asset	185	41
Total prepaid and other current assets	23,145	12,997
Other assets:
Deposits	1,951	936
Finance fees - net of amortization	10,929	13,539
Other assets	2,051	3,825
Total other assets	14,931	18,300
Accrued liabilities:
Accrued incentives	24,485	17,783
Workers compensation	6,802	7,128
Medical liabilities	3,870	3,537
Interest	10,169	3,732
Commissions payable	1,166	1,478
Contingency liability	0	2,719
Restructuring liability	867	0
Other accrued liabilities	8,729	6,486
Total accrued liabilities	56,088	42,863
Other long-term liabilities:
Deferred liability	7,088	5,591
Derivative liability	1,636	0
Other long-term liabilities	4,297	4,481
Total other long-term liabilities	13,021	10,072
Trade receivables [Member]
Accounts receivable:
Accounts receivable	90,225	79,624
Other receivables [Member]
Accounts receivable:
Accounts receivable	$ 1,386	$ 1,226